H-M Supporter - Silver Member

I know this is a long shot but ….Can anyone identify these gears?
A neighbor gave me a set of gears, but did not know anything about them. They look like a set of metric change gears for a lathe. Bore ID is approx 16mm or 5/8” and 19 mm or ¾” on the hub gear.
Along with them is a spindle adapter MT5 to MT3
Looking at the stamping and the sizes – does anyone recognize what machine they belong to?
Thanks
Jim